Two new Garter Knights were installed during the Garter Day service, which is traditionally held on the Monday of Royal Ascot week.

Former lord mayor of London Sir David Brewer and Charles Kay-Shuttleworth, 5th Baron Shuttleworth, the Lord Lieutenant of Lancashire, took up their new posts.

The Queen formally invested them with their insignia in the throne room at Windsor Castle, and at the start of the St George's Chapel service, the new companions were installed.

For seven years, Sir David, 75, was the genial, smiling figure who greeted the Queen and other members of the Royal Family whenever they carried out official engagements in the capital in his role as Lord Lieutenant of Greater London. The post ended last year when he retired.

Other members of the order include Lord Phillips of Worth Matravers - the first president of the Supreme Court, and Admiral Lord Boyce - ex-chief of the Defence Staff.

The Queen is sovereign of the order and a number of other British and foreign royals are additional members of the order.